Arthur Conan Doyle's A Study in Scarlet: Sherlock Holmes Series Book 1

A Study in Scarlet is a detective mystery novel written by Sir Arthur Conan Doyle, introducing his new character of Sherlock Holmes, who later became one of the most famous literary detective characters.

Sir Arthur Ignatius Conan Doyle (22 May 1859 – 7 July 1930) was a Scottish physician and writer, most noted for his stories about the detective Sherlock Holmes, generally considered milestones in the field of crime fiction, and for the adventures of Professor Challenger. He was a prolific writer whose other works include fantasy and science fiction stories, plays, romances, poetry, non-fiction and historical novels.
-Wikipedia.com